Box.net

Box.net is an online Web storage provider. Users can store 1GB of whatever they want or pay a little extra for more space with the service's premium plans. What really makes the service stand out is its slick-looking file-sharing widgets. Users get instant previews of images, music, and text documents. The files reside in your Box.net storage area, and as the widget owner you can even upload files through the widget.

The newer and more advanced widget enables group sharing for members with premium and professional accounts. Users can password protect a shared folder, which can then be accessed privately by others that have the code. Storage owners can also opt-in to allow user uploading, which lets anyone with access add files.